Hydrodynamic behaviour and comparison of technologies for the removal of excess biomass in gas-phase biofilters

Mendoza, Joan; Prado, Ó.J.; Veiga, María C.; Kennes, Christian

doi:10.1016/j.watres.2003.09.014

Cited by 62 publications

(41 citation statements)

References 19 publications

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“…However, when the toluene load was above 223 g m −3 h −1 , the elimination capacities of toluene did not obviously increase with the increase of the bulk loads, indicating that this biopurification followed zero-order kinetics in this concentration range, in agreement with 'the reaction limited' scenario. 12 As reported in the literature, 1,8,11 the maximum elimination capacities of toluene in biofilters, biotrickling filters and airlift bioreactors with free microorganisms were 70 g m loop bioreactor were higher than those in biofilters, biotrickling filters and airlift bioreactors with free microorganisms.…”

Section: Elimination Capacitymentioning

confidence: 55%

“…However, in a large number of countries, its discharge to the environment is hardly controlled, although ever-more stringent regulations have appeared in many industrialized countries. 1 Toluene, just like other volatile organic compounds (VOCs), has traditionally been treated by physical or chemical methods, such as absorption, adsorption, condensation and incineration. 2 However, over the past few decades the development of biotreatment technologies has led to a decrease in the relative significance of these traditional approaches.…”

Section: Introductionmentioning

confidence: 99%

“…The toluene is absorbed and degraded by naturally occurring mixed cultures immobilized on the packing. 1,6,7 Biotrickling filters work in a similar manner to biofilters, except that an aqueous phase is trickled over the packing, and that the packing is usually made of some synthetic or inert material, such as plastic rings, open pore foam, or lava rock. The trickling solution contains essential inorganic nutrients such as nitrogen, phosphorus and potassium, and is usually recycled.…”

Section: Introductionmentioning

confidence: 99%

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Removal of toluene from air streams using a gas–liquid–solid three‐phase airlift loop bioreactor containing immobilized cells

Wen

Chen

Jia

et al. 2005

J of Chemical Tech & Biotech

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Toluene, a kind of volatile organic compound (VOC), is widely used as a solvent (paints and coatings, gums, resins, rubber) as well as a reagent (medicines, dyes, perfumes) and is one of the components of gasoline. Over the more recent decades, many studies have led to the development of biological methods to treat toluene. This paper presents the results of a study on the treatment of airborne toluene using a laboratory-scale gas-liquid-solid three-phase airlift loop bioreactor containing immobilized cells. Based on the optimum operating conditions such as the temperature of 28-30• C, pH of 7.0-7.2, and an empty bed residence time (EBRT) of 39.6 s, a continuous bioprocess showed that this immobilized airlift loop bioreactor had a steady-state performance within 15 days, the outlet concentrations of toluene were lower than the national emission standard in China (GB 16297-1996), and the chemical oxygen demand and NH 4 + -N of the effluent also satisfied the primary discharge standard in China (GB 8978-1996). In addition, this immobilized airlift loop bioreactor had a good ability to tolerate shock loads, while the maximum elimination capacity of toluene was 168 g m −3 h −1 which was higher than those not only in biofilters and biotrickling filters but also in the airlift bioreactor with free microorganisms.

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Section: Elimination Capacitymentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Removal of toluene from air streams using a gas–liquid–solid three‐phase airlift loop bioreactor containing immobilized cells

Wen

Chen

Jia

et al. 2005

J of Chemical Tech & Biotech

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“…It is especially recommended for treating large volumes of moist air streams with low concentrations of biodegradable pollutants. However, a variety of strategies for optimal and sustainable operation are required, since many variables limit the efficiency of biofilters [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Desorption and Biofiltration for the Treatment of Residual Organic Gases Evolved in Soil Decontamination Processses

et al. 2007

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In order to analyze the combination of a rotary kiln and a biofilter in soil decontamination processes, a previously characterized soil was artificially contaminated with toluene, ethylbenzene or p-xylene. The desorption peak of the three compounds occurred very quickly at 20°C, and consequently, the outlet gas flow from the rotary kiln was initially divided into two different flows. One of them was reduced to a 1/9 th fraction of the total flow to be treated in an independent biofiltration system specially acclimated to each contaminant. The sharp desorption peak observed for the three compounds at the outlet of the kiln involved a very high inlet concentration fed into the biofilters in a very short period of time (shorter than 3 h). Consequently, the removal efficiency for toluene was lower than 70 %. However, the removal efficiencies for ethylbenzene and xylene were always higher than 65 %.

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“…Methods for solving these problems were described [81][82][83][84] but they are not necessarily practical. Two-stage reactor systems are proposed to avoid aforementioned…”

Section: Biological Gas Desulfurizationmentioning

confidence: 99%

Biotechnological removal of H2S and thiols from sour gas streams under haloalkaline conditions

Roman¹

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Hydrodynamic behaviour and comparison of technologies for the removal of excess biomass in gas-phase biofilters

Cited by 62 publications

References 19 publications

Removal of toluene from air streams using a gas–liquid–solid three‐phase airlift loop bioreactor containing immobilized cells

Removal of toluene from air streams using a gas–liquid–solid three‐phase airlift loop bioreactor containing immobilized cells

Desorption and Biofiltration for the Treatment of Residual Organic Gases Evolved in Soil Decontamination Processses

Biotechnological removal of H2S and thiols from sour gas streams under haloalkaline conditions

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